Luokaiwei’s heavy‑duty manhole covers are engineered for maximum safety, durability, and ease of installation. Manufactured from high‑quality spheroidal graphite (ductile) iron, they meet or exceed EN 124 and AASHTO standards for load‑bearing performance in highways, industrial zones, and utility vaults. Available in a variety of shapes, sizes, and load classes, our covers provide reliable access solutions for water, sewer, drainage, telecom, and electrical applications.
1. Typical Shapes & Sizes
| Shape | Standard Opening (mm) | Overall Frame Size (mm) | Weight (kg) |
|---|---|---|---|
| Circular | 600, 700, 800, 900 | Ø 710 – Ø 1010 | 35 – 85 |
| Square | 600 × 600, 700 × 700 | 710 × 710, 810 × 810 | 38 – 92 |
| Rectangular | 600 × 800, 700 × 900 | 710 × 910, 810 × 1010 | 45 – 100 |
| Custom (oval, D‑shape) | As requested | As requested | As specified |
All dimensions can be customized to suit project requirements. Frame depths range from 50 mm to 100 mm.
2. Chemical Composition
| Element | Standard Range (wt %) |
|---|---|
| Carbon (C) | 3.4 – 3.8 |
| Silicon (Si) | 2.2 – 3.0 |
| Manganese (Mn) | 0.10 – 0.35 |
| Magnesium (Mg) | 0.03 – 0.07 |
| Sulfur (S) | ≤ 0.02 |
| Phosphorus (P) | ≤ 0.06 |
Conforms to EN 1563 (EN‑GJS‑500‑7) or ASTM A536 Grade 65‑45‑12.
3. Mechanical Properties
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 500 MPa |
| Yield Strength (0.2 % proof) | ≥ 300 MPa |
| Elongation (A %) | ≥ 7 % |
| Brinell Hardness (HB) | 170 – 275 |
| Impact Strength (Charpy) | ≥ 7 J (at 0 °C) |
4. Load‑Bearing Classes
| EN 124 Class | Maximum Wheel Load | Typical Applications |
|---|---|---|
| A15 | 1.5 t | Pedestrian areas, sidewalks |
| B125 | 12.5 t | Car parks, light‑traffic roads |
| C250 | 25 t | Carriageways, parking lots |
| D400 | 40 t | Highways, heavy‑duty industrial |
| E600 | 60 t | Airports, docks, mining sites |
Customized Class F900 (90 t) is available on request.
5. Coating & Finishes
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Standard: Bituminous paint (160 g/m²)
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Optional: Epoxy, polyurethane, or hot‑dip galvanizing
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Surface Texture: Raised chequered, non‑slip patterns
6. Key Features
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Precision Machining: Tight tolerances on seating faces for perfect seal
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Safety Locks: Optional tamper‑proof locking mechanisms
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Identification: Custom logos, batch numbers, load‑class markings
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Easy Handling: Integrated lifting keyholes or bolt‑on lifting eyes
Why Choose Luokaiwei?
With over 15 years of foundry expertise, Luokaiwei delivers manhole covers that combine superior material chemistry, rigorous quality control, and flexible customization—ensuring your infrastructure projects are safe, compliant, and built to last. For detailed drawings, samples, or tailored quotes, please contact our sales team today.
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